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15. What are the different ways in which sexual selection cantake place? Why does sexual dimorphism occur?

16. Why does diversity between individuals and between speciescreate problems for determining what is a species and what is avariant?

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Jean Keeling
Jean KeelingLv2
29 Sep 2019

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Related questions

Suppose you were studying several species of monkeys. In one, males never helped females raise offspring. In another, males provided just as much parental care as females except for actually carrying the fetus during pregnancy. How does the fundamental asymmetry of sex compare in the two species? How would you expect sexual dimorphism to compare between the two species?

A) For the species in which the males never help raise offspring, the fundamental asymmetry of sex is small and sexual dimorphism should be lower than for species in which males always help raise offspring.
B) For the species in which the males never help raise offspring, the fundamental asymmetry of sex is pronounced and sexual dimorphism should be lower than for species in which males always help raise offspring.
C) For the species in which the males never help raise offspring, the fundamental asymmetry of sex is small and sexual dimorphism should be higher than for species in which males always help raise offspring.
D) For the species in which the males never help raise offspring, the fundamental asymmetry of sex is pronounced and sexual dimorphism should be higher than for species in which males always help raise offspring.

What sexual selection is; the two general strategies that living things might use to achieve reproductive success. How the relative numbers of male and female individuals affect the reproductive strategy of each sex, and the characteristics of the two different strategies. Where and how sexual selection might occur in different kinds of organisms.

Demonstrating sexual selection. Two things that need to be done experimentally to show that sexual selection is occurring, and how they are done.

4. Imagine that you are studying a species of guppy in which mature males are observed to have bright orange tails, while females and immature fish have grey tails. You decide to test whether sexual selection can explain this dimorphism.

a) Describe an experiment to test this hypothesis. Include details about what you will measure. Draw and label two diagrams: one showing potential data that would refute your hypothesis, the other showing potential data that would support it.

b) A competing colleague discovers that some mature males in this population have grey tails, and publishes a paper claiming that this evidence shows that sexual selection could not explain the dimorphism in tail color in this species. Do you agree or disagree? What observations or experiments could help you refute your colleague’s conclusion?

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